Reading Virtual Serial Port with MicroC for 8051 - c

Question

I have a problem , please help me.
for about a project homework ı need read from virtual serial port with microC and send this info to AT89C52 microconttoller..
This is my source code:
int uart_rd;
void main() {
P1=0X00;
UART1_Init(9600);
delay_ms(100);
while(1)
{
if(UART1_Data_Ready()){
uart_rd=UART1_read();
if(uart_rd=='1')
{P1=0X01; delay_ms(1500); P1=0X00; }
if(uart_rd=='2')
{P1=0X02; delay_ms(1500); P1=0X00; }
}
}
}
BUT I cant get info from the port. Where is the mistake.Please help me...

Answer 1

You are defining your UART receive variable (uart_rd) as an int, which is a 2 byte variable. I would expect UART1_read() to return a single byte (char).
I am not familiar with your particular setup or debugging/troubleshooting options, but you might try writing some code to assist in debugging your issue. The following example may be useful. It does assume that LEDs are connected to both port 1 and port 2, so some adjustment may be necessary.
char uart_rd;
void main()
{
UART1_Init(9600); // Initialize UART at 9600 bps
delay_ms(100); // Wait for UART to stabilize
while(1)
{
if(UART1_Data_Ready())
{
P2 = 0xFF; // Turn ON PORT2 LEDs upon data ready
uart_rd = UART1_read(); // Receive data
P1 = uart_rd; // Display data on port 1 LEDs
UART1_write(uart_rd); // Transmit same data back
delay_ms(1500); // Brief delay
P1 = 0x00; // Turn OFF port 1 LEDs
P2 = 0x00; // Turn OFF port 2 LEDs
}
}
}